Cutter for removing cable insulations



Patented Dec. 29, 1925.

UNITED STATES PATENT OFFICE.

DEAN C. OBER AND ALBERT R. ASKUE, 0F EAST CLEVELAND, OHIO.

CUTTER FOR-REMOVING- CABLE INSULATIONS.

Applications-.filed November 3, 1923. Serial No. (372,683.

high voltage cables to provide arecess toy receive a connector such as shown and described in our application filed October' 1, 1923, Serial No. 665,794, the object of the invention being to provide an exceedingly simple and highly eiiicient tool by means of which a smooth tapering recess can be quickly and easily cut and properly centered Y with reference to the conductor and the methe conductor of the cable can be utilized as a centering guide.

Y Another object is to provide a tool of the kind described comprising two parts, one of which is fitted to the cable and upon which the other part ts, the first part serving as a' centering guide for the cutter member.

Another obiect is to so construct the cutter that the same is drawn inwardly as the cutting operation proceeds.

With thesevarious object in view the invention consists in the novel fea-tures of construction and in the manner of combining or arranging the same all of which will be fully described hereinafter and 4set forth in the appended claims.

In the drawings forming a part of this specication, Fig. 1 is a view illustrating our improved construction of cutter at the initial stage; F ig. 2 is a similar view showing the position the various parts assume at the completion of the cutting operation; Fig. 3 is an end view of the cutter; and Fig. 4 is an enlarged detail sectional view showing a portion of the cutter.

Referring to the drawings 10 indicates the conductor, 11 the factory applied insulation which is usually oil saturated paper tightly wound about the conductor 10, and 12 is the lead covering applied tothe enterior of the factory applied insulation, these three elements constituting the stands ard type of high voltagevcable now einployed. s

When it is desired to join two sections of this type of cable it is desirable to cut a tapering recess into the factory insulation in order to receive a connector such as shown and described in ourapplication before referred to, and in practice a small portion of the lead covering and factory insulation is removed so as to leave the end of the conductor slightly protruding.

After this is done a guiding sleeve 13 is applied to the end of the cable, said sleeve having an exterior annular shoulder 14 and the end of the sleeve is slightly tapered` as shown at 15. r1`he sleeve is also formed with an inwardlyprojecting shoulder 16 which is intended to abut against the end of the lead covering 12 as most clearly shown and thereby position the sleeve 13 upon the end of the cable.

The cutter comprises the central or core portion 17 and a spiral blade portion 18, the central core portion being formed with the conductor receiving opening or bore 19 eX- tending therethrough.

The extreme yforward vend of the cutting lade is projected slightly forwardly as indicated at 20 in order to cut into the factory insulation 11, and serve to pull the cutterinwardly, and it will be noted that the inclined faces of the flights 18 are cut away 'slightly at their inner ends as shown at 21, and that the extreme rear ends which forms the continuous cutting edge are carried slightly rearwardly as indicated at 22 so that spiral shavings will be vcut from the factory insulation, andas the. tool is fed in# wardly by rotation atapering recess will be cut, and as the cutter feeds inwardly the conductor 10 passes into the central recess or bore 19 of the cutter. In this manner the cutter is guided at the center and aproper- 1y centered recess is provided. The -rear end of the cutter is substantially cylindrical in shape as shown at 23 and fits snugly into the rear end of a guiding and centering cage 24 and operating handles 25 are passed lthrough oppositely disposed openings produced in the cage and screwed into the cylindrical portion 23 of the cutter thereby effectively connecting the cutter and cage and providingv the movable portion of the tool.

penings of considezffible arca are produced in the forward portion of the cage in order to permit the discharge of the shavings o' insulation as they emerge from the cutting blade.

The interior diameter of the forward portion of the cage 24 is substantially equal to the reduced portion of the sleeve 13 and is intended to lit thereon as the tool is moved forwardly or inwardly in order to affect the cutting operation and the tapered end of the sleeve facilitates the fitting of the cage on the sleeve. The shoulder 14; serves as a stop to limit the inward orvforward movement of the cutter as it is. obvious that when the end of the cage contacts with the shoulder la all further progress is arrested, and the continued revolution of the cutter after this stoppage has been effected serves to finish olf the walls of the recess, imparting a polish thereto and completely eliminating any rough or portruding edges or portions.

As the cage moves along the reduced portion of the guiding sleeve the centering operation is completed inasmuch as we then have the centering effected from both the interior and the exterior, the conductor l() passing into the central bore of the cutting blade providing the interior centering means, and the contact of the cage with the exterior of the guiding sleeve providing the exterior centering means.

The forward end of the cutter being shaped as previously described bitesy into the insulation and feeds the cutter forwardly and owing to the special shape of the spiral Hight of the cutter' the insulation will be quickly and easily cut off in spiral shavings and discharged at the sides through the openings 26.

When the recess is completed the tool is reversed and the cage slipped from the guiding sleeve and this sleeve is then removed from the end of the cable and the joining or connecting operations can then proceed.

It will therefore be seen that we provide a strong, durable, easily operated and highly eflicient form of tool for cutting properly centered tapering recesses in the ends of a high voltage cable having factory wound insulation and a metallic covering.

It will also be understood that this tool can be used upon any and all varieties of cables in which insulation of this general type is employed and it will also be understood that slight changes and modifications canjbe madeto. suit varying .conditions of cable construction without departing from the broad principle of our invention as de` fined in the claims.

Having thus described our invention, what we claim is:

l. ln a device of the kind described the combination kwith a shouldered guide sleeve adapted to engage the exterior surface of a cable, of a centrally .bored spiral cutter and a cage in which said cutter is arranged and provided with rotative `',Ineans, said cage being adapted to fit upon the guide sleeve thereby to locate said cutter centrally with respect tothe exterior surface of said cable.

2. In a device of the lkind described the combination with a shouldered cable enga-ging sleeve adapted to` engage theexterior surface of a cable, of a cutter provided with rotative means and with "means for -enffag ing the cable engaging-sleeve andv boulder thereof thereby to locate said cutter centrally with respect to the exterior surface of said cable. Y Y

3. A devicevof the kind described comprising a sleeve providedwithy interior and exterior shoulders, said sleeve litting upon a cable end, and a tapering cutter having a conductor receiving bore, said tapering cutter being arranged in a 'cage adapted to fit upon the sleeve, and having means for rotating said cage and cutter.

il. A device of the kind described com- Y' prising a sleeve provided with interior and yexterior shoulders and ,adapted to lit snugly over a cable with said interior shoulder engaging the end of said cable, a tapering cutter having va central conductor receivin bore, a cage in which the cutter ts an handles connecting the cage and cutter and providing means for rotating said cage and cut-ter, said cage being adapted to fit upon the end of the sleeve, thereby to locate said cutter centrally with respect to the exterior surface of said cable.

5. In a device of the kind described, Vva cutter comprising a centrally bored core and a tapered spiral cutting flight, the forward end of said flight being projected forwardly to bite into the material to becut, and having a continuous cuttingr edge upon the lrear of said flight.

ln testimony whereof, we hereunto aflix our signatures.

DEAN C. OBER. ALBERT R. ASKUE. 

